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(No Model.) 3 Sheets-Sheet 1. LA M. C. ATWOOD.

ELECTRIC ARG LAMP. No. 448,107.

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ELECTRIC ARG LAMP. 70 No. 448,107. Patented Mar. 10,1891.

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(No Model.)

LA M. C. ATWOOD. ELECTRIC ARG LAMP No. 448,107. Patented Mar. 10, 1891.

- UNITED STATES PATENT OFFICE.

` LA MOTTE (l. ATVOOD, OF ST. LOUIS, MISSOURI, ASSIGNOR TO THE ATWIOOD ELECTRIC COMPAXY, OF SAME PLACE.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 448,107', dated March 10, 1891.

pplioation filed October 28,1890. Serial No. 869,547. (No model.)

To @ZI whom, it 11m/1] concer/L.-

Be it known that I, LA MOTTE C. Arwoon, of the city of St. Louis, in the State of Missouri, have invented a certain lnew and useful Imvprove1nent in Electric-Arc Lamps, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specilication.

My invention relates to certain improvements in that class of electric-arc lamps having a motor for moving the carbons as they are consumed 5 and my invention consists in features hereinafter fully described, and pointed ont in the claim.

Figure I is an elevation illustrative of my invention. Fig. Il is an enlarged top or plan view. Fig. III is an enlarged view of the circuitdistributing switches. Fig. IV is an enlarged section of the automatic clutch. Fig. V is a side elevation of the lamp. Fig'. VI is a diagram illustrating the arrangement of the wires, ttc.

Referring to the drawings, 1 represents the 2 5 base of the lamp, which may be supported on legs 2. Over the base 1 is a plate 3, connected to the base by rods e. Between the base and plate are located the main magnets 5, through which the circuit passes to the carbons and shunt-magnets G. On top of the plate 3 is the motor 7, an armature S of the magnets 5, and an armature fl of the magnets G.

represents a tube or rod fitting in sockets or openings made in the base 1 and plate 3. It has an arm 11 at its upper end, which carries a clamp 12 for holding the upper carbon 13. On one side of the rod 10 there is a rack 1l, engaged by a pinion 15, secured to a shaft 1U. The shaft is journaled in the upper ends of standards 17, secured to the plate 3.

18 represents a tube or rod fitting in sockets or openings made in the plate 3 and base 1. This rod or tube has an arm 19 on its lower end, which carries a clamp 2O for holding the lower carbon 21. On one side of this rod there is a rac t 22, engaged by a pinion 23 on the shaft 1P. The turning of the shaft 1G causes the carbons to be moved to orfrom 5o cach other, (according to which way the shaft is turned,) and for the purpose of causing the upper carbon to be moved faster than the lower one (on account of its more rapid consumption) the pinion is made larger than 55 the pinion 21 represents a worm-heel loosely mounted on the shaft 1G and which engages a worm 25 on a shaft 2G, arranged atright angles to the shaft 1G and journaled in standards 6o 27, extending upward from the plate 3 or from a cross-piece 2S, reaching from one of the standards 17 to the other. (See Fig.

II.) On the shaft 2G there is also secured a worm-wheel 29, which engages a worm on 65 the extended end of a shaft 31 of the motor 7. represents the lieldmagnets, located over the motor 7.

represents a sliding clutch mounted on the shaft 1G, so as to have end movement 7o thereon, but forced to turn therewith by a feather-and-groove or other suitable connection. A feather is shown at 3l, Fig. II. This clutch has pins to engage holesSG in the face of the worm-wheel l.- The clutch has Sufficient end movement on the shaft to permit the pins to be disengaged from the holes, as shown in Figs. I and II.

37 represents a lever pivotcd as shown at 3S, Fig. I, and the upper end of which is forked 8o or bifurcated to embrace the clutch and has pins 39 entering` a circumferential groove O in the clutch. The lower end of the lever is connected by a link al to the inner end of a bell-crank lever I2, pivoted at 43, and the outer end of which is connected by a linlt 4I to the outer edge of the armature 8. The inner edge of the armature 8 is hinged to the plate 3, as shown at I5, Fig. I. It will be understood that when the armature S is at- 9o tracted by the magnets 5 the clutch through means of the described connection will be forced into engagement with the worm-wheel 24, and thus cause the shaft 2G to be turned by the motor through means of the described connection. IVhen the magnets release the armature, the clutch is drawn out of engagement with the wormavheel by' a spring 46,

connected to theiower end ot' the lever 37. The armature 9 is hinged to the plate 3, as shown at 47, Fig. ll. Its free end is held in its upper position, when not attracted by the magnets 6, by a spring 48, (see Fig. V,) on the upper en d of which is secured a threaded rod 49, which passes through a plate 5t) on the upper end of a standard 51', mounted on the plate 3. (See Fig. I.) f

On the rod 49 is a thumb nut 52 above the plate 50, by which the tension of the spring 48 may be regulated. rlhe thumb-nut may be held from accidental turning bya pawl 53, engaging notches 5i on the thumb-nut.

On the free end of the armature 9 there is a projection 55, having an upper contactpoint 56 and a lower contact-point 57, and another projection 58, having an upper contact-point 59 and a lower contact-point 60. The projections 55 and 58 are insulated from the armature, preferably, by means of a piece ot hard rubber 61, by which they are securedl to the armature. (See Fig. V.)

62 represent-s an 4upper plate, against which the contact-point 56 may impinge; 63, an intermediate plate, against the upper surface of which the contact-point 57 may impinge and against the lower surface ot` which the contactpoint 59 may impinge, and 64 a lower plate, against which the contact-point 60 may i'mpinge. The plates 62, 63, and 64 are' all secured to and supported by a standard on the plate 3, the plates being insulated from the standard, or the standard may be composed of some non-conductive material. The movement of the armature 9 by the magnets 6 in one direction and by the spring 48 in the other direction causes the contact-points to impinge their respective plates.

I will now` describe the arrangement ot' the wires and the operation of the lamp.

represents a wire leading from the electric supply to the magnets 5.

7l represents a wire leading from the magnets 5 to the upper-carbon clam-p 12, and 72 a wire leading'froin the lower-carbon clamp 20. The current passing through the magnets 5 pulls the armature 8 down and engages the clutch 33 with the worm-wheel 24.

73 represents a wire leading from a branch 70 of the wire 70 to the intermediate plate 63, through which a portion ot the current passes from the wire 70 to the plate 63, thence through the contact-point 59, thence through a wire 74, thence to the field-magnets ot the motor,l thence through a wire 75 to contactpoint 56, thence through the upper plate 62, thence through a wire 76, thence to the brush 77 of the commutator 78 of the motor, thence through the armature 79 of the motor, thence fromthe armature of the motor through the brush 80`of the commutator of the motor, and thence through a wire 81 to the wire 7l of the upper carbon. This current causes the motor to run backward and through the described connection causes the carbons to be moved apart to produce the are.

82 represen ts a wire leading from the branch 70a of the wire 70 and through which a current passes to the shunt-magnets,V thence carbon. The shunt-magnets are of high resistance, and the amount of current passing through them depends upon the length of the arc of the carbons. As soon as the resistance is sufficient the magnets draw the armature 9 down, breaking the contact between the point 56 and't-he upper plate 62 and between the point 59 and the under side ,of the plate 63, cutting oft the current to the motor,which ceases to move.

As the carbons are consumed and the resistance increased, the shunt-magnets draw the armature 9 down farther until the contactpoint 57 comesagainst the upper side ot' the plate 63 and the point 60 comes against the-lower plate 64, when the motor will be turned forward to feed the carbons together by the current passing from wirev 73 through the plate 63, the contact-point 57, and through the wire 75, returning through the wire 74 and to the armature of the motor through the wire 76. As soon as the carbons have been fed sufficiently and the resistance decreased the armature 9 rises, breaking the contact between the points 57 and 60`and their plates 63 and 64, when the current to the motor will be cut ott again and it will cease to turn until the carbons are consumed .suthcientlyto create theI necessary resistance to cause the armature toy be drawn down again and start the motor forward to feed the carbons again, and thus the operation goes on continuously, the current to t-he motor being made and broken as the resistance of the carbons increases and diminishes. l

90 represents a plate beneath the plate 64, and with vwhich the branch wire 70 from the wire 70 connects, and beneath the free end of which isa contact-point 92, from whichl a wire 93 extends to the wire 72. Now, incase anything should happen to the motor, so that it would not start when the armature 9 has been drawn down, as explained, the further downward movement of the armature will bring an insulated projection 94 down upon the plate 90 and force its free end against the point 92, thus establishing a contact between the wires 91 and 93, through which the current will pass around the lamp. As soon as this takes place the magnets 5 will release the armature 8, when the clutch will be disengaged and the carbons will drop together. The armature 9 will then be released, the current will pass to the main magnets 5' again, theclutch will be again engaged, the motor will be turned backward again to form the arc, and the parts will all proceed to perform their functions.y

- through a wire S3 to the wire 72 of the lower IOO IIO

I claim as my inventionl oted bell-omnk lever, a link Connecting said l In an electric-are lamp, the combination of levers, and i link connecting said bell-Crank 1o carbon-supporting rods, a motor, n train of l lever to said armature, Snbstnniially as and gearing located between the motor and rods i foi` the purpose set forth. andeontaining an automatic olutoli by which l LA MOTTE C. ATWOOD. the gearing is tlnown into and out of notion, ln piesenoe of- .L magnet and armature, a springnetuated THOS. KNIGHT,

i l pivoted lever connected to said clutch, n pivl A. M. EBERSOLE. 

